"Now that you have an idea of what a BASE jump ought to look like, get your hands on some BASE video. The best video for this is the "Lemmings Exits" series from Bridge Day (http://www.lemmingsvideo.com/). Try to get several years of "Lemmings Exits", and whatever other BASE video you can find. Watch the video, preferably with your BASE mentor. Evaluate each jump. The more errors you can see before jumping, the more likely you are to avoid them yourself."
The Lemmings video link in the intro to base is a bad link.
edit to add:
Also the baserig link is invalid and the vertigo link are invalid. All 3 links point to aggregated relational link farms.